Ashly PQX-571, PQX-572 Introduction, Unpacking, Ac Power, AUDIO CONNECTORS AND CABLES 4.1Balanced

Operating Manual - PQX 571 and PQX 572 Parametric Equalizer

1.INTRODUCTION

Congratulations on your purchase of an Ashly PQX series parametric equalizer. Like graphic equaliz- ers, parametric equalizers allow you to boost or cut se- lected frequencies. Unlike graphic equalizers however, parametric equalizers can tune in the exact frequencies you want and control the bandwidth of each selected fre- quency band, resulting in very precise control of frequency response.

The Ashly PQX series equalizers are a third gen- eration design including many refinements on our origi- nal PQ models. Lower noise, greater headroom, addi- tional filters, full 20Hz -20KHz range on all parametric filters and additional connector types are the result. The parametric filters are still based on the “state variable” type circuit, and a separate summing amplifier is used for each filter so that no interaction between bands oc- curs.

2.UNPACKING

As a part of our system of quality control, every Ashly product is carefully inspected before leaving the factory to ensure flawless appearance. After unpacking, please inspect for any physical damage. Save the ship- ping carton and all packing materials , as they were care- fully designed to reduce to minimum the possibility of transportation damage should the unit again require pack- ing and shipping. In the event that damage has occurred, immediately notify your dealer so that a written claim to cover the damages can be initiated.

The right to any claim against a public carrier can be forfeited if the carrier is not notified promptly and if the shipping carton and packing materials are not avail- able for inspection by the carrier. Save all packing mate- rials until the claim has been settled.

3.AC POWER

Your PQX equalizer should be connected to a standard 3-wire grounded electrical outlet supplying 120 Volts, 50-60 Hz (some export models are wired for 240 Volts, and are labeled as such). To reduce the risk of ground loop hum, connect all audio equipment to the same electrical power source. Removal of the ground pin is both unlawful and dangerous, as a potential shock hazard could result.

This unit will perform normally within an AC voltage range of 94 to 130 volts. Voltages less than this, as found in “brown-out” conditions, will reduce headroom and decrease power supply regulation. While this may affect performance, the equalizer will continue to func- tion during a brown-out. This unit has an internal line

fuse. In the unlikely event that the fuse should blow, refer the product to a qualified technician for servicing. Overall power consumption is less than 15 watts.

4.AUDIO CONNECTORS AND CABLES

4.1Balanced

Ashly uses electronically balanced inputs on all equalizers. The inputs and outputs can be used balanced or unbalanced. Your PQX series equalizer is provided with three different connector types. 1/4 inch stereo phone

jacks, three pin XLR type connectors, and a terminal strip will allow interfacing to most professional audio prod- ucts. The (+) signal is on the tip of the phone plug and pin 2 of the XLR connector. The (-) signal is on the ring of the phone plug and pin three of the XLR. To achieve best performance, we recommend using balanced connec- tions between all components in your system, as this re- duces ground-loop induced hum and common-modenoise.

4.2Unbalanced

If either inputs or outputs are used unbalanced, the signal is on the (+) connection and the (-) connection must be tied to ground. A mono phone plug used as an unbalanced connection will automatically ground the ring of the jack which is the (-) connection. When using a stereo plug, XLR connector, or the terminal strip for un- balanced input or output connections, the signal (-) MUST be tied to the sleeve, or a significant loss of signal level may result.

3